Expansion valve for refrigerating machines



Nov. 8, 1,515,648

M. v. ARNOLD EXPANSION VALVE FOR REFRIGERATING MACHINES Filed Jan. 11. 1924 WAMN lrnllllllllllllllllln;In

INVENTOR atented New. 18, W24.

I at.

nrnnvm v. nnnonn, or EVANSVILLE, INDIANA.

Application and January ll, 924. sale No. 685,580. a

' To alZ w/zm it may concern asbl sidesof the device Be it known that I, MERVIN V. ARNOLD, a citizen of the vansville,

and the State of Indiana, have invented cer- M invention relates to an improved form 0 expansion valve particularly designed to be used in connection with a .refrigerat-- ing wh' apparatus of the compression type in ich there is employed the usual compressor, condenser and expansion chamber; t e said valve belng particularly for use in refrigerating systems of this character employing a refrigerant. which boils at atmospheric pressure at a sufiiciently low degree below the freezing point to roduce the "temperature required in are rigerant at atmospheric pressure.

t is a primary object ofthis invention to construct a valve in which the difference in pressures of the compression and exhaust will be utilized.

It is a further object of this invention not only to seal thecom ression 'side,-but also to seal the exhaust si e of the valve against any pressure leakage.

t is a further object to provide means of adjusting the pressure so that a proper a ance may provide improvements in the details of the device. g 1

Other objects will be more fully hereinafter set out in the drawings, s ecifications and claims in which the metho s of accomplishing these objects will be' more fully ereinafter set out.

In the drawings: V

. Fig. 1,- is a sectlonal elevation on the center line showing fully all the details of the valve. 1

Fig. 2, is a diagrammatic view on a reduced a refrigerating system. r

Referring now to the drawings in which the various parts are indicated by the same numerals in all the views. 1 is a diagrammatic view of a compressor assembly. 2 isa pressure pipe leading from the compression side of the compressor 1 to a conadapted be arrived at and generally to fl wh the annular shoulder 21 formed in the boss densing coil 3. 4 is a pipe leading fromthe condensing coil to the lower half 5 ofthe expansion valve. 6 is a pipe leading from the expansion valve to the expansion coil 7.

8 1s a suction pipe leading from the ex-- pansion coil to the suction side of the com-. pressor 1. 9 is a connecting pipe from the suction pipe8 to the upper half -10 of the expansion valve.

From this description it will be seen that when the compressor is in operation the compression side will be directly connected be directly connected to the upper half 10 of the same expansion valve.

expansion valve consists of an upper or suction half 10 and a lower or compression half 5'separated by a diaphragm 11 which diaphragm is clamped between-the flanges 12 and 13 of the l spectively and is hermetically sealed by means of gaskets 14 and 15which gaskets are compressed against the diaphragm by the bolts 16 which hold the two halves of t e valve to ether. The diaphragm 11 is provided wit a centrally disposed. opening through which the central threaded portion of the flanged member 17 projects, the diaphragm being similarly clamped against the flanges 18 of this member by means of a nut 19. Should it be found'necessary,

191 is an extremely thin metal bellows whichis brazed at its opposite end to an annular plate 20 ich plate is adapted to be clamped against 22' which extends outward from. and is in tegral with the upper half 10 of the valve, t e said annular plate being securely clamped against the shoulder 21 by means of the threaded plu 23. This 23 is tapped to receivea t and isdrilled or bored out to slidably receive a cylindrical plug 25, against the upper side of which the thumb bolt 24 bears, and between the lower side of which and the upper side of the flange spring 26. I While I have not shown it, it will of course be understood that a gasket may be shoulder 21 in order to secure a hermetically ower and upper half re- A plu ireaded thumb olt 24 18 is a compression Ill) , needle point seat 29in there are a numb stressed so'far as the mechanical construe-- system.

sealed joint, though I prefer in such case to use white'lead, or some such material for this purpose.

27 is a valve stem which is screwed into the flange member 17 and is moved upward and downward by the diaphragm ll.

28 of this stem co-acts with a the boss 30 extending below the lower half of the valve casing 55. When the balance of pressure between the vacuum in the upper'half 10 of the valve, and the pressure in the lower half 5 of the same reaches the determined point 'as determined by the regulation of'the' compression spring 26, .this needle valve opens and permits the compressed refrigerating liquid to flow through the pipe 6 to the expansion chamber. When the pressure builds up in the expansion chamber from the expansion of this liquid to a point above that which the surrounding medium can absorb, the vacuum necessarily becomes less and the valve closes, thus cutting oil the flow until the vacuum is again increased.

It will'be seen from this description that er of points especially tion is concerned;

First, the hermetical sealing of the diaphragm 11 between the two halves of the casing.

Second, the sealing of the central opening through the diaphragm, and

Third, the sealing of the upper half of the valve from the adjusting means and from the outside atmosphere at the opening through which this adjusting means is inserteu.

It will further be seen that so far as the action of the valve, is concern that it is governed by three things acting together,

First, the pressure of the refrigerating medium as delivered through the pipe 4:.

- Second, the vacuum in the upper half of the valve, and

Third, the tension on the comprbssion spring 26.

In this lies the essential difference between my valve and those valves which depend upon the balance of forces between atmospheric pressure and'the pressure on the compression side of the refrigerating In compression systems of this type the compression pressure if properly regu lated, is constant so that it is necessary to introduce some variable which in this case, is the amount of vacuum.

As I have discovered and believe, the balance of the forces between the compression side and the exhaust side of the circulating system is balance of the forces between the compression and the atmosphere only.

In order that the invention may be understood, the details of the preferred form member and means passing said section and said passageway, a much better regulator than the of my device have been set forth but it will be apparent that persons skilled in the art may resort to various modifications without departing from the purpose and spirit of my invention. 1

Having now fully described my invention what I claim and desire to secure by Letters Patent of the United States is 1. In a device of the character described a valve chamber con'iprising a pressure section, a passage leading from the compression side of a refrigerating system thereto, a centrally disposed boss extending from the said section, a pi'pe'leading from the said boss to the expansion chamber of system; and a vacuum section having a' passage leading therefrom to the vacuum side of said system; a diaphragm separating said sections, having tween the peripheral edges of said sections and sealed to each of them, a central opening through said diaphragm, a flanged memher having a threaded hub extending through said opening, a nut clamping and sealing said diaphragm to the said member; a valve seat in the boss on the pressure section intermediate said section and said pas:

'sageway, a valve stem secured into the hub of said flanged member, and having a valve thereon cooperating with said seat, a centrally disposed boss extending from sai vacuum section, an outwardly disposed annularseat formed in said boss, an annular plate adapted to seat thereagainst, a cylindrical metal bellows hermetically sealed between said annular flange and said flanged member, a threaded plug securing and sealing said annular plate, a pressure plug, a thumb screw bearing a compression spring said flanged member. a

2. In a device of the character described a valve chamber comprising a pressure section, a passagev leading from the compression side of a refrigerating system thereto, a centrally disposed boss extending from the said section, a pipe leading from the said boss to the expansion ating system; and a vacuum section having a passage leading therefrom to the vacuum side of said system; a diaphragm separating said sections, having its periphery clamped between the peripheral edges of said sections and sealed to each of them, a central openings through said diaphragm a flanged through said clamping and sealing said iato said member, a valve seat in the the pressure section intermediate a valve stem secured into said flanged member, and having a valve thereon cooperating with saidseat, a centrally disposed. boss extending from said vacuum sec y between said plug and opening phragm boss on ion, an outward disposed annular seat formed in said boss,

a refrigerating its periphery clamped be-- against said plug andchamber of a refrigerleading from said section, a centrally an annular plate adapted to seat thereagainst, a cylindrical metal bellows hermetically sealed between said annular plate and said flanged member, means securing and sealing said annular plate, a compression spring bearing against said flanged member, and means for regulating the tension thereof. 3. In a device of the character described a valve chamber comprising a pressure section, a passage leading from the compression side of a refrigerating system thereto, a pdipe 1sposed valve seat between said pipe and said section, and a vacuum section having a passage leading therefrom to the vacuum side of said said sections, having its periphery clamped between the peripheral edges of said sections and sealed to each of them, a central opening through said diaphragm, a member and means extending through said openin clamping and sealing said dia hragm to sai member, a valve stem secured into said member, and having a valve thereon cooperating with said seat, a centrally disposed boss extending from said vacuum section, an out wardly disposed annular seat formed in said boss, an'annular plateadapted' to seat thereagainst, a cylindrical metal bellows hermetically sealed between said annular plate and said diaphragm member, a threaded plug sesaid diaphragm.

system; a diaphragm separating curing and sealing said annular plate, and means for regulating the tension against 1 4. In a device of the character described a valve chamber, comprising a pressure section, a passage leadingfrom the compression side of a refrigerating system thereto, a centrally disposed pipe leading from the said boss to the expansion chamber of a re-" means clamping and seal oo-operating with said seat, a centrally disposed boss ex-- tending from said vacuum section, an outwardly disposed annular seat formed in said boss, an annular against, a cylindrical metal bellows hermetically sealed'betweeu said annularflange and said flanged member, means securing and sealing said annular plate, and means ,for regulating the tension against said diaphragm.

In testimony whereofI have hereunto set my name.

l MERVIN V. ARNOLD. Witnesses;

Jon F. BUERGER, HARRY E. Borne.

plate adapted to seat there-' 

